package com.mongodb.core;

import java.net.UnknownHostException;
import java.util.List;

import org.bson.types.ObjectId;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

public class MongoDb {
	//1.建立一个Mongo的数据库连接对象
	static Mongo connection = null;
	//2.创建相关数据库的连接
	static DB db = null;
	public MongoDb(String dbName) throws UnknownHostException, MongoException{
		connection = new Mongo("127.0.0.1:27017");
		db = connection.getDB(dbName);
	}
	public static void main(String[] args) throws UnknownHostException, MongoException {
		//实例化
		MongoDb mongoDb = new MongoDb("foobar");
	    /**
	     * 1.创建一个名字叫javadb的数据库
	     */
//		mongoDb.createCollection("javadb");
		/**
		 * 2.为集合javadb添加一条数据
		 */
//		DBObject dbs = new BasicDBObject();
//		dbs.put("name", "uspcat.com");
//		dbs.put("age", 2);
//		List<String>  books = new ArrayList<String>();
//		books.add("EXTJS");
//		books.add("MONGODB");
//		dbs.put("books", books);
//		mongoDb.insert(dbs, "javadb");
		/**
		 * 3.批量插入数据
		 */
//		List<DBObject> dbObjects = new ArrayList<DBObject>();
//		DBObject jim = new BasicDBObject("name","jim");
//		DBObject lisi = new BasicDBObject("name","lisi");
//		dbObjects.add(jim);
//		dbObjects.add(lisi);
//		mongoDb.insertBatch(dbObjects, "javadb");
		/**
		 * 4.根据ID删除数据
		 */
//		mongoDb.deleteById("502870dab9c368bf5b151a04", "javadb");
		/**
		 * 5.根据条件删除数据
		 */
//		DBObject lisi = new BasicDBObject();
//		lisi.put("name", "lisi");
//		int count = mongoDb.deleteByDbs(lisi, "javadb");
//		System.out.println("删除数据的条数是: "+count);
		/**
		 * 6.更新操作,为集合增加email属性
		 */
//		DBObject update = new BasicDBObject();
//		update.put("$set", 
//				new BasicDBObject("eamil","uspcat@126.com"));
//		mongoDb.update(new BasicDBObject(),
//				update,false,true,"javadb");
		/**
		 * 7.查询出persons集合中的name和age
		 */
//		DBObject keys = new BasicDBObject();
//		keys.put("_id", false);
//		keys.put("name", true);
//		keys.put("age", true);
//		DBCursor cursor = mongoDb.find(null, keys, "persons");
//	    while (cursor.hasNext()) {
//		    DBObject object = cursor.next();
//		    System.out.println(object.get("name"));
//	    }
	    /**
	     * 7.查询出年龄大于26岁并且英语成绩小于80分
	     */
//		DBObject ref = new BasicDBObject();
//		ref.put("age", new BasicDBObject("$gte",26));
//		ref.put("e", new BasicDBObject("$lte",80));
//		DBCursor cursor = mongoDb.find(ref, null, "persons");
//	    while (cursor.hasNext()) {
//		    DBObject object = cursor.next();
//		    System.out.print(object.get("name")+"-->");
//		    System.out.print(object.get("age")+"-->");
//		    System.out.println(object.get("e"));
//	    }
		/**
		 * 8.分页例子
		 */
		DBCursor cursor = mongoDb.find(null, null, 0, 3, "persons");
	    while (cursor.hasNext()) {
		    DBObject object = cursor.next();
		    System.out.print(object.get("name")+"-->");
		    System.out.print(object.get("age")+"-->");
		    System.out.println(object.get("e"));
	    }		
		//关闭连接对象
		connection.close();
	}
	/**
	 * 穿件一个数据库集合
	 * @param collName 集合名称
	 * @param db  数据库实例
	 */
	public void createCollection(String collName){
		DBObject dbs = new BasicDBObject();
		db.createCollection("javadb", dbs);
	}
	/**
	 * 为相应的集合添加数据
	 * @param dbs
	 * @param collName
	 */
	public void insert(DBObject dbs,String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		//2.插入操作
		coll.insert(dbs);
	}
	/**
	 * 为集合批量插入数据
	 * @param dbses
	 * @param collName
	 */
	public void insertBatch(List<DBObject> dbses,String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		//2.插入操作
		coll.insert(dbses);
	}
	/**
	 * 根据id删除数据
	 * @param id
	 * @param collName
	 * @return 返回影响的数据条数
	 */
	public int deleteById(String id,String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		DBObject dbs = new BasicDBObject("_id", new ObjectId(id));
		int count = coll.remove(dbs).getN();
		return count;
	}
	/**
	 * 根据条件删除数据
	 * @param id
	 * @param collName
	 * @return 返回影响的数据条数
	 */	
	public int deleteByDbs(DBObject dbs,String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		int count = coll.remove(dbs).getN();
		return count;
	}
	/**
	 * 更新数据
	 * @param find 查询器
	 * @param update 更新器
	 * @param upsert 更新或插入
	 * @param multi 是否批量更新
	 * @param collName 集合名称
	 * @return 返回影响的数据条数
	 */
	public int update(DBObject find,
						DBObject update,
						boolean upsert,
						boolean multi,
						String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		int count = coll.update(find, update, upsert, multi).getN();
		return count;
	}
	/**
	 * 查询器(分页)
	 * @param ref
	 * @param keys
	 * @param start
	 * @param limit
	 * @return
	 */
	public DBCursor find(DBObject ref, 
			DBObject keys,
			int start,
			int limit,
			String collName){
		DBCursor cur = find(ref, keys, collName);
		return cur.limit(limit).skip(start);
	}
	/**
	 * 查询器(不分页)
	 * @param ref
	 * @param keys
	 * @param start
	 * @param limit
	 * @param collName
	 * @return
	 */
	public DBCursor find(DBObject ref,
			DBObject keys,
			String collName){
		//1.得到集合
		DBCollection coll = db.getCollection(collName);
		DBCursor cur = coll.find(ref, keys);
		return cur;
	}	
}






